CN104318191B - A kind of adaptive method of works of UHF RFID - Google Patents
A kind of adaptive method of works of UHF RFID Download PDFInfo
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- CN104318191B CN104318191B CN201410548413.3A CN201410548413A CN104318191B CN 104318191 B CN104318191 B CN 104318191B CN 201410548413 A CN201410548413 A CN 201410548413A CN 104318191 B CN104318191 B CN 104318191B
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Abstract
A kind of adaptive method of works of UHF RFID of disclosure of the invention, including 3 self study processes：By the way that UHF RFID tag test boards are placed in into the specific region that antenna is read, number of tags and corresponding RSSI value that statistics read write line is read under each frequency, frequency in the range of frequency hopping is screened, select wherein several optimal reading frequencies to use to do frequency hopping point, so as to improve reading efficiency；By the way that UHF RFID tag test boards are placed in into the specific region that antenna is read, test is adjusted in transmission power during to interrogating and examining, and test obtains the minimum emissive power that disclosure satisfy that and interrogate and examine requirement.The present invention can successfully manage that fixed UHF RFID readers application environment is changeable, and the problem of parameter setting is numerous and diverse makes fixed UHF RFID readers reach preferably using effect.
Description
Technical field
The present invention proposes a kind of adaptive method of work based on the fixed UHF RFID readers of AS3992, belongs to Internet of Things
Net microwave radio identification technology field.
Background technology
With the development of Internet of Things industry, ultrahigh frequency readers (UHF RFID) technology due to identification distance it is remote, know
The features such as other accuracy rate height, fast recognition speed, strong antijamming capability, has obtained rapid popularization, gradually forms a kind of brand-new management
Means.Because fixed UHF RFID readers application environment is changeable, parameter setting is numerous and diverse, is brought much not to operator
Just, so reader can be automatically configured according to application environment, to reach that optimal using effect is just necessary.
Fixed UHF RFID readers typically have multiple antennas (i.e. multichannel), for the use of multiple antennas, are mostly
It is configured in host computer (i.e. PC or the server being controlled to reader), first selects the antenna to be used, then enter
Row some interrogate and examine read-write etc. operation；Or the time that some antennas required for needing artificial set switch.This artificial selection
Or set antenna mode can not well adapt to application environment, when have in fixed reader antenna need add or
, it is necessary to which the connection for artificially understanding antenna is configured again during removal；Number of tags hair in each antenna correspondence scene
During raw change, setting before may not be optimal.Multiple antennas in the present invention, which automatically switches, is detained self-learning method
Then it is capable of the connection of automatic detection exterior antenna, it is not necessary to which human intervention can just set up preferably antenna switching scheme.
UHF RFID readers have multiple frequency ranges due to the national difference used, and the conventional frequency range of China is 920MHz
To between 925MHz.These frequency ranges are divided into multiple frequencies by step-length of 0.25MHz, but generally only several in actual use
It is best, of the invention frequency hopping point selection self-learning method that individual frequency, which reads effect, is based on this consideration, to select it
In it is several it is optimal reading frequencies used to do frequency hopping point, so as to improve reading efficiency.
The transmission power of read write line is a critically important parameter.Read write line is to the operating distance of electronic tag, main meeting
Determined by the transmission power, transmission power is bigger, then operating distance is more remote.The transmission power of read write line can be joined by system
Number sets to adjust, and can be divided into what or continuously adjustabe.But transmission power is too big, power consumption is on the one hand added, it is on the other hand right
Surrounding environment can be then caused than larger electromagenetic wave radiation.The power adjusting self-learning method of the present invention is then intended to count by some
Calculation process, sets a minimum power, interrogates and examines out all labels in environment automatically.
The content of the invention
The technical problems to be solved by the invention are to improve the reading efficiency of ultrahigh frequency readers.
In order to solve the above technical problems, the present invention provides a kind of adaptive method of works of UHF RFID, it is characterised in that bag
Include multiple antennas automatic switchover and be detained self study process, specifically include following steps：
11) the antenna holdup time with X milliseconds for least unit, i.e., one interrogate and examine the cycle shortest time；Switch an institute
There is the time that antenna is interrogated and examined as a switching cycle；
12) each mobile radio holdup time (in the holdup time, antenna carries out interrogating and examining work)
At least include N number of time slot, include up to M time slot, time slot refers to each antenna and interrogates and examines time from start to end
Gap in section, time slot length is relevant with the number of tags read during interrogating and examining, so time slot length and not knowing；
13) outside control carries out the periodicity of self study process, i.e. control switching and carries out the number of times of self study again；
14) determine whether that antenna is connected by the backward power of each antennal interface, set up antenna switching table, including
Mobile radio ID and the corresponding relation for being detained timeslot number；
15) enter row label continuously to interrogate and examine, each antenna is detained T and interrogated and examined the cycle, i.e., the antenna is right in antenna switching table
The delay timeslot number answered；
16) it is S switching cycle to carry out self study process every time, and antenna switching table is updated only before learning process starts；
If 17) give in the antenna holdup time and do not interrogate and examine label, timeslot number subtracts 1, but minimum N；
If 18) number of tags that antenna holdup time inner disc is found interrogates and examines the 120% of label average, time slot more than antenna
Number Jia 1, and timeslot number maximum is set to numerical value M1, if the number of tags that antenna holdup time inner disc is found interrogates and examines label more than antenna
The 140% of average, then timeslot number adds 1, and timeslot number maximum is set to numerical value M2, wherein M1<M2<=M；The antenna is interrogated and examined
Label average is that the number of tags that all antennas are read in a switching cycle is counted, then in multiple switching cycles
The number of tags that all antennas are read is taken the mean；
If 19) number of tags that antenna holdup time inner disc is found interrogates and examines the 70% of label average, time slot less than antenna
Number subtracts 1, and timeslot number minimum is set to N1, N1>N, can read label, but number of tags is less than the 70% of label average；
20) repeat step 17) -19) M switching cycle of self study is carried out, determine antenna switching table.
A kind of foregoing adaptive method of works of UHF RFID, it is characterised in that：Also include frequency hopping point selection self study
Journey, specifically includes following steps：
21) acquiescence working frequency range is 920MHz-925MHz, passes through outside selection frequency range；
22) it is 0.25MHz that frequency, which increases step-length, sets up frequency hopping table；
23) whether the interference of detection foreign frequency, which exceedes threshold value, is carried out to all frequencies in frequency hopping table, if in frequency meter
The corresponding foreign frequency interference of frequency exceedes the corresponding threshold value of frequency, then the frequency is removed from frequency hopping table, jumped while changing
Activity frequency points, frequency correspondence threshold value and frequency access times in frequency table, set up quasi- activity frequency hopping Table A；24) quasi- activity is taken
All frequencies are tuned operation respectively in frequency hopping Table A；
25) in the built-in day-mark label test environment of read range, that is, N number of UHF RFID tags test board, N >=2, label are set up
Test board is both placed in the front of reading antenna, is placed in parallel with reading antenna, general to set two；
26) call all frequencies in frequency hopping table to enter row label successively to interrogate and examine, this process is used as a hop period；
27) N number of hop period is continuously interrogated and examined, the number of tags of each frequency reading is counted；
28) choose and read the optimal frequency hopping Table A intermediate-frequeney point of effect, if retaining all in the case of reading label effect identical
Frequency hopping point, constitutes quasi- frequency hopping table B, reads effect using the number of tags that can read as evaluation criteria, the number of tags read
It is more, represent that effect is better；
29) continuous to interrogate and examine M hop period, the signal for counting the reception that each frequency reads label in quasi- frequency hopping table B is strong
Degree indicates (RSSI) average value；
210) contrast test, retains the maximum frequency hopping point of RSSI value in quasi- frequency hopping table, constitutes quasi- frequency hopping table C；
211) the randomly ordered final frequency hopping table of generation of alignment frequency hopping table C intermediate-frequeney points.
A kind of foregoing adaptive method of works of UHF RFID, it is characterised in that：Also include power adjusting self study process,
Specifically include following steps：
31) install antenna in the range of expected read operation and set up label test environment, that is, set up N number of UHF RFID
Label test board, N >=2, label test board is all placed on the front of reading antenna, is placed in parallel with reading antenna；
32) interrogate and examine the stage, continuously interrogated and examined with peak power first in read write line, obtain the mark in maximum read range
Sign number A；
33) adjustment power reduction 1dBm；
34) cycle is interrogated and examined as a test period using N number of, make the number of tags that reads and step 32) the number of tags A of detection
Unanimously；
35) repeat step 33), 34) operate, terminated when number of tags that reader is interrogated and examined reduces；
36) current power is added into 1dBm and preserved, be used as minimum power；
37) continuous N time is interrogated and examined, and tests its read stability, i.e., if it exceeds M/3 times can not read number of tags A, that
Minimum power adds 1dBm and preserved；
If 38) minimum power is their ability to the peak power set, alarm is pointed out, and is re-started antenna installation and is returned
Return step 31).
The beneficial effect that the present invention is reached：
The adaptive method of works of UHF RFID based on AS3992 of the present invention, realize the fixed UHF RFID of multiple antennas
The automation of work is confirmed after reader increase and decrease antenna, in time the number of tags adjust automatically day in the scene according to residing for each antenna
The line holdup time, the reading efficiency in the case of multiple antennas switching is continuously interrogated and examined can be effectively improved.Realize in used frequency
The purpose of several more excellent frequencies is chosen in section, read-write efficiency is improved using more excellent frequency.Power can be automatically adjusted, makes reading
Device reduces power consumption in the case where meeting read-write operation, reduces the Radio frequency interference to surrounding environment.
Brief description of the drawings
Fig. 1 sets schematic diagram for the label test board of the present invention.
Embodiment
The present invention proposes 3 kinds of self study processes, and reader can be made to have given play to good using effect in use.
The present invention is the related self-study mechanism of the RFID reader based on AS3992 chips.Below to 3 kinds of self-study mechanisms
Main points do following explanation：Automatically switch including multiple antennas and be detained self study, the self study of frequency hopping point selection and power adjusting self study
Three processes,
(A) multiple antennas, which automatically switches, the time is detained self-study mechanism includes following main points：
11) the antenna holdup time with X milliseconds for least unit, i.e., one interrogate and examine the cycle shortest time；Switch an institute
There is the time that antenna is interrogated and examined as a switching cycle；
12) each mobile radio holdup time (in the holdup time, antenna carries out interrogating and examining work) at least includes N number of time slot,
Include up to M time slot, time slot refers to each antenna and interrogates and examines gap in the period from start to end, and time slot length is with interrogating and examining
During the number of tags that reads it is relevant, so time slot length and not knowing；
13) outside control carries out the periodicity of self study process, i.e. control switching and carries out the number of times of self study again；
14) determine whether that antenna is connected by the backward power of each antennal interface, set up antenna switching table, including
Mobile radio ID and the corresponding relation for being detained timeslot number；
Antenna switching table is as shown in table 1.
Table 1
| Mobile radio ID | It is detained timeslot number |
| 0 | 3 |
| 1 | 3 |
| 2 | 3 |
| 3 | 3 |
15) enter row label continuously to interrogate and examine, each antenna is detained T and interrogated and examined the cycle, i.e., the antenna is right in antenna switching table
The delay timeslot number answered；
16) it is S switching cycle to carry out self study process every time, and antenna switching table is updated only before learning process starts；
If 17) give in the antenna holdup time and do not interrogate and examine label, timeslot number subtracts 1, but minimum N；
If 18) number of tags that antenna holdup time inner disc is found interrogates and examines the 120% of label average, time slot more than antenna
Number Jia 1, and timeslot number maximum is set to numerical value M1, if the number of tags that antenna holdup time inner disc is found interrogates and examines label more than antenna
The 140% of average, then timeslot number adds 1, and timeslot number maximum is set to numerical value M2, wherein M1<M2<=M；The antenna is interrogated and examined
Label average is that the number of tags that all antennas are read in a switching cycle is counted, then in multiple switching cycles
The number of tags that all antennas are read is taken the mean；
If 19) number of tags that antenna holdup time inner disc is found interrogates and examines the 70% of label average, time slot less than antenna
Number subtracts 1, and timeslot number minimum is set to N1, N1>N, can read label, but number of tags is less than the 70% of label average；
20) repeat step 17) -19) M switching cycle of self study is carried out, determine antenna switching table.
This method realizes the automation that work is confirmed after the fixed UHF RFID readers increase and decrease antenna of multiple antennas, and
When the scene according to residing for each antenna in the number of tags adjust automatically antenna holdup time, can effectively improve multiple antennas switching company
Continue the reading efficiency in the case of interrogating and examining.
(B) frequency hopping point selection self-study mechanism includes following main points：
21) acquiescence working frequency range is 920MHz-925MHz, passes through outside selection frequency range；
22) it is 0.25MHz that frequency, which increases step-length, sets up frequency hopping table；Frequency hopping tabular form sample is as shown in table 2：
Table 2
23) whether the interference of detection foreign frequency, which exceedes threshold value, is carried out to all frequencies in frequency hopping table, if in frequency meter
The corresponding foreign frequency interference of frequency exceedes the corresponding threshold value of frequency, then the frequency is removed from frequency hopping table, jumped while changing
Activity frequency points, frequency correspondence threshold value and frequency access times in frequency table, set up quasi- activity frequency hopping Table A；Quasi- activity frequency hopping
Table A citing is as shown in table 3：
Table 3
24) all frequencies in quasi- activity frequency hopping Table A are taken to be tuned operation respectively；
25) in the built-in day-mark label test environment of read range, that is, N number of UHF RFID tags test board, N >=2, label are set up
Test board is both placed in the front of reading antenna, is placed in parallel with reading antenna, general to set two；
26) call all frequencies in frequency hopping table to enter row label successively to interrogate and examine, this process is used as a hop period；
27) N number of hop period is continuously interrogated and examined, the number of tags of each frequency reading is counted；
28) choose and read the optimal frequency hopping Table A intermediate-frequeney point of effect, if retaining all in the case of reading label effect identical
Frequency hopping point, constitutes quasi- frequency hopping table B, reads effect using the number of tags that can read as evaluation criteria, the number of tags read
It is more, represent that effect is better；
29) continuous to interrogate and examine M hop period, the signal for counting the reception that each frequency reads label in quasi- frequency hopping table B is strong
Degree indicates (RSSI) average value；
210) contrast test, retains the maximum frequency hopping point of RSSI value in quasi- frequency hopping table, constitutes quasi- frequency hopping table C；
211) the randomly ordered final frequency hopping table of generation of alignment frequency hopping table C intermediate-frequeney points.
This method realizes the purpose that several more excellent frequencies are chosen in used frequency range, is carried using more excellent frequency
High read-write efficiency.
(C) power adjusting self-study mechanism includes following main points：
31) install antenna in the range of expected read operation and set up label test environment, that is, set up N number of UHF RFID
Label test board, N >=2, label test board is all placed on the front of reading antenna, is placed in parallel with reading antenna；
32) interrogate and examine the stage, continuously interrogated and examined with peak power first in read write line, obtain the mark in maximum read range
Sign number A；
33) adjustment power reduction 1dBm；
34) cycle is interrogated and examined as a test period using N number of, make the number of tags that reads and step 32) the number of tags A of detection
Unanimously；
35) repeat step 33), 34) operate, terminated when number of tags that reader is interrogated and examined reduces；
36) current power is added into 1dBm and preserved, be used as minimum power；
37) continuous N time is interrogated and examined, and tests its read stability, i.e., if it exceeds M/3 times can not read number of tags A, that
Minimum power adds 1dBm and preserved；
If 38) minimum power is their ability to the peak power set, alarm is pointed out, and is re-started antenna installation and is returned
Return step 31).
This method can automatically adjust power, reader is reduced power consumption in the case where meeting read-write operation, reduce
To the Radio frequency interference of surrounding environment.
The present invention is illustrated according to the preferred embodiment, it will be appreciated that above-described embodiment does not limit this in any form
Invention, the technical scheme that the form of all use equivalent substitutions or equivalent transformation is obtained, all fall within protection scope of the present invention it
It is interior.
Claims (3)
1. a kind of adaptive method of works of UHF RFID, it is characterised in that automatically switch including multiple antennas and be detained self study process,
Specifically include following steps：
11）The antenna holdup time with X milliseconds for least unit, i.e., one interrogate and examine the cycle shortest time；Switch all days
The time that line is interrogated and examined is used as a switching cycle；
12）Each mobile radio holdup time at least includes N number of time slot, includes up to M time slot, time slot refers to each antenna and interrogated and examined
The gap in period from start to end；
13）Outside control carries out the periodicity of self study process, i.e. control switching and carries out the number of times of self study again；
14）Determine whether that antenna is connected by the backward power of each antennal interface, set up antenna switching table, including activity
Antenna ID and the corresponding relation for being detained timeslot number；
15）Enter row label continuously to interrogate and examine, each antenna is detained T and interrogated and examined the cycle, i.e., the antenna is corresponding in antenna switching table
It is detained timeslot number；
16）It is S switching cycle to carry out self study process every time, and antenna switching table is updated only before learning process starts；
17）If not interrogating and examining label in the given antenna holdup time, timeslot number subtracts 1, but minimum N；
18）If the number of tags that antenna holdup time inner disc is found is interrogated and examined the 120% of label average more than antenna and is less than or equal to
Antenna interrogates and examines the 140% of label average, then timeslot number adds 1, and timeslot number maximum is set to numerical value M1, if the antenna holdup time
The number of tags that inner disc is found interrogates and examines the 140% of label average more than antenna, then timeslot number adds 1, and timeslot number maximum is set to number
Value M2, wherein M1<M2<=M；It is to all antennas are read in a switching cycle label that the antenna, which interrogates and examines label average,
Number is counted, and then the number of tags that all antennas in multiple switching cycles are read is taken the mean；
19）If the number of tags that antenna holdup time inner disc is found interrogates and examines the 70% of label average less than antenna, timeslot number subtracts 1,
And timeslot number minimum is set to N1, N1>N, can read label, but number of tags is less than the 70% of label average；
20）Repeat step 17）-19）M switching cycle of self study is carried out, antenna switching table is determined.
2. a kind of adaptive method of works of UHF RFID according to claim 1, it is characterised in that：Also clicked including frequency hopping
Self study process is selected, following steps are specifically included：
21) acquiescence working frequency range is 920MHz-925MHz, passes through outside selection frequency range；
22) it is 0.25MHz that frequency, which increases step-length, sets up frequency hopping table；
23）Carry out whether the interference of detection foreign frequency exceedes threshold value to all frequencies in frequency hopping table, if the frequency in frequency meter
Corresponding foreign frequency interference exceedes the corresponding threshold value of frequency, then removes the frequency from frequency hopping table, while changing frequency hopping table
In activity frequency points, frequency correspondence threshold value and frequency access times, set up quasi- activity frequency hopping Table A；
24) all frequencies in quasi- activity frequency hopping Table A are taken to be tuned operation respectively；
25) in the built-in day-mark label test environment of read range, that is, N number of UHF RFID tags test board, N >=2, label test are set up
Plate is both placed in the front of reading antenna, is placed in parallel with reading antenna；
26) call all frequencies in frequency hopping table to enter row label successively to interrogate and examine, this process is used as a hop period；
27) N hop period continuously is interrogated and examined, counts the number of tags of each frequency reading；
28) choose and read the optimal frequency hopping Table A intermediate-frequeney point of effect, if retaining all frequency hoppings in the case of reading label effect identical
Point, constitutes quasi- frequency hopping table B, reads effect using the number of tags that can read as evaluation criteria, the number of tags read is more,
Represent that effect is better；
29) it is continuous to interrogate and examine M hop period, count the signal intensity that each frequency in quasi- frequency hopping table B reads the reception of label
Indicate（RSSI）Average value；
210) contrast test, retains the maximum frequency hopping point of RSSI value in quasi- frequency hopping table B, constitutes quasi- frequency hopping table C；
211) the randomly ordered final frequency hopping table of generation of alignment frequency hopping table C intermediate-frequeney points.
3. a kind of adaptive method of works of UHF RFID according to claim 1 or 2, it is characterised in that：Also include power
Self study process is adjusted, following steps are specifically included：
31) install antenna in the range of expected read operation and set up label test environment, that is, set up N number of UHF RFID tags
Test board, N >=2, label test board is all placed on the front of reading antenna, is placed in parallel with reading antenna；
32) interrogate and examine the stage, continuously interrogated and examined with peak power first in read write line, obtain the number of tags in maximum read range
Mesh A；
33) adjustment power reduction 1dBm；
34) cycle is interrogated and examined as a test period using N, make the number of tags and step 32 read）The number of tags A mono- of detection
Cause；
35) repeat step 33）, 34) operate, terminated when number of tags that reader is interrogated and examined reduces；
36) current power is added into 1dBm and preserved, be used as minimum power；
37) continuous N time is interrogated and examined, if it exceeds M/3 times can not read number of tags A, then minimum power adds 1dBm and preserved；
If 38) minimum power is the peak power that can be set, alarm is pointed out, and is re-started antenna and is installed return to step
31）.
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| CN104931925A (en) * | 2015-06-05 | 2015-09-23 | 福建工程学院 | Self-adaptive method based on reference label RFID positioning |
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| CN111611819B (en) * | 2020-05-26 | 2023-10-31 | 成都睿畜电子科技有限公司 | Antenna self-checking method for UHF group scanning and checking system |
| CN111967547B (en) * | 2020-07-06 | 2021-11-05 | 深圳市成为信息技术有限公司 | Multi-label checking method, electronic equipment and storage medium |
| CN111860752B (en) * | 2020-07-06 | 2021-06-15 | 深圳市亿云联科技有限公司 | RFID counting channel with width adjustable function and working method thereof |
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| CN112261687A (en) * | 2020-10-22 | 2021-01-22 | 北京计算机技术及应用研究所 | Air interface signal interference detection method for ultrahigh frequency RFID system |
| CN113283258B (en) * | 2021-06-02 | 2024-04-23 | 上海宜链物联网有限公司 | Method capable of automatically searching optimal working frequency point of electronic tag and reading device |
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